Die for upsetting flanges on rivets



O. H. BROWN. DIE PUR UPSETTING 'FLANGES 0N mvmrs. N0. 430.874.

(N0 Model.)

PatentedJune 17, 1890.

\/VITNEESEEEt UNITE-D STATES PATENT FFICE.

CHARLES HAZEN BROWVN, OF BOSTON, MASSACI-IUSETIS.

DIE FOR UPSETTING FLANGES QN RIVETS.

SPECIFICATION forming part of Letters Patent N0. 430,374, dated June 1'7, 1890.

Applicaion filed January 24, 1890. Serial N0. 338,001. (N0 model.)

T0 all wh07n zlt 7nay c0ncern:

Be it known that I, CHARLES HAZEN BROWN, of Boston, in the county 0f Snifolk and State of Massachusetos, have invented certain new and useful Improvements in Dies f0r Upsee fing; er Flanging Rivets, of Whieh the following is a speeifieation.

-This invention relates 130 the operation 0f upsetting rivets which are provided witl1 solid shanks having cup-pointed outer ends whieh are spread 01 turned outwardly t0 forma second head 0r flange.

The invention has for its object t0 provide improved means whereby the spreading 0r outzward turning 0f the enp-pointed end of the rivet may be eifeeted by suecessive operations rapidly performed; and 110 these ends io eonsist-s in a flange-forming die composed 0f a plurality 0f parts, preferably two, one 0f whieh comprises the cent-ral portion and the otlier the marginal or outer portion of the fiange-forming die, the Said central portion being supported by a st0ut spring above the aeting faee of the marginal portion, the arran gemeni: being such (hat when the rivet is pressed against the cent-ral portion the supporting-spring of the latter will hold said eentral porlzion With suffieienb firmness to enable it t0 spread the cnp-poined end of the rivet nntil the bottom of the recess in the rivet bears upon the aeting face o'f the eentral portion, the latter then yielding until it is substantially fiusl1 With the marginal portion 0f which presents a eontinuous edge free fronr Of the aeeompanying drawings, forming a part of chis specification, Figure 1 represenos a side elevation 0f my improved die in coujunetion With means for supporting i and for pressing the rivet against it. Figs. 2, 3, and 4 represent seetions, 011 a larger seale,

showing the operations 0f the die in forming the second flange 0f the rive. Fig. 5 represents a modifieation, showing the die madein three parts.

The Same letters 0f reference indicate the same parts in all the fignres.

In carrying out my invention, referring 110 Figs. l, 2, 3, and 4,1 provide a die f0r the formation 0f the fiange 0r seeond head 011 a cup-poined rivet d, 0f substantially the form shown in Fig. 2, said die being eomposed of a body z, preferably 0f eylindrical form, havin; at one end a eoncave aeting face a and provided With a longitudinal bore or soeket extending fron1 said faee through said body, the faee being therefore 0f annular form, and a core or rod j, fitted t0 move lengthwise in said bore 01 soeket and provided ab its outer end witl1 an aeting faee a, 0f eonieal 0r approximately conieal form. The c0re 0r rodj is su pported With its acting face a above the acting face a by means of a stout spring b, whieh is adapted to yield until said aeting face a is at its marginal p0rti0n substantially flnsh With theinneredge of the actingface a, as shown in Figx4. The arrangementof: the springb maybe variouslymodified; but I do n0t limit myself 1:0 any partieular arrangement. I have here shown thespring supported between its ends by a bearing 7c, attaehed to the supporting frame m, whieh holds the body z 0f the die, one end 0f said spring being engaged with a groove in the lower end 0f the rod 01 eore j, while the other end bears upon a screw 0, whicl1 is adjustable in the frame m and enables the tension 0f the spring b so be adjusted. p represents a plunger or forcer whieh is arranged to press the rivet dagainst the eore j and die-body z'. Said plunger may be ree-iproeated by any su'itable meehanism; but as the plunger and means for operating it form 110 part of the present invention the operating meehanism is noo shown.

The rivet (Z, being inserted in the pieees of material r 7 to be united and plaoed between the plunger p and the die 11 j, as shown in Fig. 2, the, eupped end of the rivet resting on the elevated face a 0f the eore j, the plunger is pressed downwardly until the cupped end of the rivet is spread upon the conical face a, as shown in Fig. 3. The spring b is sufliciently stiff o0 support the core j and prevent it from yielding while the cupped end is being nhus spread; bui; when tl1e solid portion 0f the shank 0f the rivet comes t0 a bearing on the faee a the eontinued pressure exerted by the plunger p througl1 the rivet-shank causes the corej to yield until alle margin 0f ehe face a is snbstantially flush with the inner margin of the face a, as shown in Fig. 4, tl1e partially-turned fiange 011 the cupped end of the rivet being then pressed against the coneave face a, and therefore spread and converted into a eomplete second flange, as shown in Fig. 4c.

I1; is important that the yielding movennent 0f the eore j be limited, so thal; the margin 0f. the face a will not fall bel0w the inner 1nargin 0f the face a, as otherwise the said inner margin woulcl form a shoulder projecting above the face a, whieh would defaee 01 eut the 0Ul361 surface of the eompleted flange formed by the describecl operation. I therefore provide a stop s ab the l0wer end 0f the core 01' ro(l j, arranged to arresl: the yielding movement 0f said c0re when its act-ing face a reaehes the position shown in Fig. 4. Said st0p is preferably an acljustable screw, which may be sei; 130 permit a greater 01 less dis placemenr, as may be required.

113 Will be seen tl1at the tw0 operations, although successivd, may be perfonned in such quick succession tl1at the flange-forming ope1ation Will be as rapid as if the flange were formed entirely by a die 01 'anvil composed 0f one piece. I have found in practice that by spreading the cupped end 0f the rivet; by two snceessive operations tl:1e liabiliy of craeking the 1netal of' the flange thus formecl is entirely obviated, and a flange is produeed having a eontinuous 01 unbroken margin.

I do not limit myself to making the die in two secoions 01 parts, as in s0me cases i may be desirable EO make the die in 1nore than two sections. Fig. 5 shows th1ee sections-viz., the rod 01 cordj, the outer portion 01 body z, and an intermediate tubular core j, ehe latter being supported by a spring b below ehe acb ing faee of the core j and above the acting face of. the body z, and arranged to partially spread the end of tl1e rivet after the inibial spreading by the face a and before the final spreading by the face a.

I elaim l. A rivet-flange-forming die eomposed of an inelosing part 01 body, and one 01 more yielding cores 0r seetions located within said body and normally projeeting above the acting faee thereof, as set forl1.

2. A rivet-fiange-forming die composed of an inclosing part or body having an operating faee at one end, and a movable core within said body, having an operating face which is normally held Witl1 a yielding pressure above the operating face 0f said body, as Set f ortl1.

3. The combination 0f tl1e die-body having an operating face, a 001e 01 plunger movable in said body and having an operating face surrounded by the operating face of said body, and a spring whereby the eore is 110rn1ally supported with i11s operating face above tl1e operating; faee of tl1e die-body, as set forth.

4. 'lhe combination 0f the die composed 0f the body z and the spring-Supported eore j, a holder f01. said parts, and a plunger arranged to force tl1e rivet against said c0re and diebody, as set forth.

5. The eombinauion of the die composed of the body i and ehe spring-supported eorej, a holder for said parts, a plunger arranged 110 force he rivet against said c0re and die-body, and a stop t0 limit the yielding movement of ehe core, as sei; forth.

In testirnony whereof I have signed my name so this specification, in ehe pressenee oft l1WO subscribing wionesses, this 11th day of January, A. D. 1890.

CHARLES HAZEN BRO\VN. 

